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Retirement Plans and Postretirement Benefits - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | $ 0.6 | $ 0.9 | $ 1.3 | $ 1.7
Interest cost | 3.0 | 3.1 | 5.9 | 6.2
Expected return on plan assets | (3.9) | (3.8) | (7.9) | (7.6)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (0.3) | 0.2 | (0.6) | 0.4
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Service Cost | 0.1 | 0.0 | 0.1 | 0.1
Interest cost | 0.7 | 0.7 | 1.3 | 1.4
Defined Benefit Plan, Amortization of Gain (Loss) | (0.1) | 0.1 | (0.1) | (0.3)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 0.6 | 0.6 | 1.3 | 1.2
Cost of Sales [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 0.6 | 0.8 | 1.1 | 1.5
Selling, General and Administrative Expenses [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.3

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